參數(shù)資料
型號(hào)： ADA4841-2YCPZ-R2
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 7/21頁(yè)
文件大?。?/td> 0K
描述： IC OPAMP VF R-R LP 60MA 8LFCSP
標(biāo)準(zhǔn)包裝： 1
放大器類(lèi)型： 電壓反饋
電路數(shù)： 2
輸出類(lèi)型： 滿擺幅
轉(zhuǎn)換速率： 13 V/µs
-3db帶寬： 80MHz
電流 - 輸入偏壓： 3µA
電壓 - 輸入偏移： 40µV
電流 - 電源： 1.2mA
電流 - 輸出 / 通道： 60mA
電壓 - 電源，單路/雙路(±)： 2.7 V ~ 12 V，±1.35 V ~ 6 V
工作溫度： -40°C ~ 125°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 8-WFDFN 裸露焊盤(pán)，CSP
供應(yīng)商設(shè)備封裝： 8-LFCSP-WD
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： ADA4841-2YCPZ-R2DKR
ADA4841-1/ADA4841-2
Rev. E | Page 14 of 20
The output noise spectral density can be calculated by
[]
2
4
1
4
F
G
F
S
G
F
R
ien
kTRg
R
ven
R
ien
kTRs
R
kTRf
en
vout
+
+
+
=
_
(6)
where:
k is Boltzmann’s Constant.
T is the absolute temperature, degrees Kelvin.
ien is the amplifier input current noise spectral density, pA/√Hz.
ven is the amplifier input voltage spectral density, nV/√Hz.
RS is the source resistance as shown in Figure 40.
RF and RG are the feedback network resistances, as shown in
Source resistance noise, amplifier voltage noise (ven), and the
voltage noise from the amplifier current noise (ien × RS) are
all subject to the noise gain term (1 + RF/RG). Note that with a
2.1 nV/√Hz input voltage noise and 1.4 pA/√Hz input current,
the noise contributions of the amplifier are relatively small for
source resistances between approximately 200 Ω and 30 kΩ.
shows the total RTI noise due to the amplifier vs. the
source resistance. In addition, the value of the feedback resistors
used impacts the noise. It is recommended to keep the value of
feedback resistors between 250 Ω and 1 kΩ to keep the total
noise low.
1000
0.1
10
100k
05614-007
SOURCE RESISTANCE (
Ω)
NOISE
(
n
V/
Hz)
100
10
1
100
1k
10k
TOTAL AMPLIFIER NOISE
SOURCE RESISTANCE NOISE
AMPLIFIER + RESISTOR NOISE
Figure 41. RTI Noise vs. Source Resistance
HEADROOM CONSIDERATIONS
The ADA4841-1/ADA4841-2 are designed to provide maximum
input and output signal ranges with 16-bit to 18-bit dc linearity.
As the input or output headroom limits are reached, the signal
linearity degrades.
The input stage positive limit is almost exactly a volt below the
positive supply at room temperature. Input voltages above that
start to show clipping behavior. The positive input voltage limit
increases with temperature with a coefficient of about 2 mV/°C.
The lower supply limit is nominally below the minus supply;
therefore, in a standard gain configuration, the output stage
limits the signal headroom on the negative supply side. Figure 42
and Figure 43 show the nominal CMRR behavior at the limits of
the input headroom for three temperatures—this is generated
using the subtractor topology shown in Figure 44, which avoids
the output stage limitation.
300
–300
3.00
5.00
05614
-055
COMMON-MODE VOLTAGE (V)
C
O
M
O
N-
M
O
DE
E
RRO
R
(
μV)
260
220
180
140
100
60
20
–20
–60
–100
–140
–180
–220
–260
3.20 3.40 3.60 3.80 4.00 4.20 4.40 4.60 4.80
–40°C
+25°C
+125°C
Figure 42. +CMV vs. Common-Mode Error vs. VOS
0
–800
–6.00
–4.00
05614-054
COMMON-MODE VOLTAGE (V)
COMMON-
MODE
ERROR
(
μV)
–50
–100
–150
–200
–250
–300
–350
–400
–450
–500
–550
–600
–650
–700
–750
–5.80 –5.60 –5.40 –5.20 –5.00 –4.80 –4.60 –4.40 –4.20
–40°C
+25°C
+125°C
Figure 43. CMV vs. Common-Mode Error vs. VOS
+ VOUT –
– VCM +
05614-
051
Figure 44. Common-Range Subtractor
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